OLED display device and preparation method thereof

Abstract

An OLED display device and a preparation method thereof are provided. The OLED display device includes a flat region and a bent region around the flat region; the bent region is bent toward a backlight side of the flat region, and the bent region includes at least one stretching region; the stretching region comprises a display region and a first etching region, the first etching region is located at an edge of the display region away from the flat region and is connected with at least part the edge of the display region at the side away from the flat region; the display region includes at least one opening, and a boundary of the first etching region and the display region bypasses the opening; the display region includes a first display film layer, and the first etching region is a region where the first display film layer is etched away.

The invention claimed is: 
     
       1. An OLED display device, comprising a flat region and a bent region around the flat region; wherein
 the bent region is bent toward a backlight side of the flat region, and the bent region comprises at least one stretching region; 
 the stretching region comprises a display region and a first etching region, wherein the first etching region is located at an edge of the display region at a side away from the flat region, and the first etching region is connected with at least a part of the edge of the display region at the side away from the flat region; 
 the display region comprises at least one opening, and a boundary between the first etching region and the display region bypasses the opening; 
 the display region comprises a first display film layer, and the first etching region is a region where the first display film layer is etched away. 
 
     
     
       2. The OLED display device according to  claim 1 , wherein the boundary between the first etching region and the display region comprises a plurality of concave portions and a plurality of convex portions arranged alternately. 
     
     
       3. The OLED display device according to  claim 2 , wherein the display region comprises at least two openings, the concave portions bypass the openings, and the convex portions are located between adjacent openings. 
     
     
       4. The OLED display device according to  claim 3 , wherein the at least two openings comprise at least two first slits, and the at least two first slits extend along a first direction and are arranged at intervals along a second direction, and the first direction is different from the second direction, the concave portions bypass ends of the at least two first slits, and the convex portions are located between adjacent at least two first slits. 
     
     
       5. The OLED display device according to  claim 3 , wherein the display region comprises at least three openings, and the at least three opening comprise at least two first slits and at least one second slit, wherein the at least two first slits extend along a first direction and are arranged at intervals along a second direction, the at least one second slit extends along the second direction, and the first direction is different from the second direction, the at least one second slit is located between adjacent at least two first slits and at least one groove is formed by the at least one second slit in combination with the at least two first slits, the concave portions bypass ends of the at least two first slits, and the convex portions are located in the at least one groove. 
     
     
       6. The OLED display device according to  claim 3 , wherein a minimum distance between the boundary and an edge of an opening is equal to a minimum distance between edges of adjacent openings. 
     
     
       7. The OLED display device according to  claim 3 , wherein corners of the concave portions and/or the convex portions are rounded corners. 
     
     
       8. The OLED display device according to  claim 7 , wherein a radius of a rounded corner equals to 3 to 10 times a width of an opening. 
     
     
       9. The OLED display device according to  claim 1 , wherein the opening is a rectangle with rounded corners. 
     
     
       10. The OLED display device according to  claim 1 , wherein the first etching region comprises a functional structure film layer that wraps an edge of the first display film layer. 
     
     
       11. The OLED display device according to  claim 10 , wherein the functional structure film layer comprises a first functional film layer and a second functional film layer provided oppositely, and a connection layer provided between the first functional film layer and the second functional film layer, and the connection layer wraps the edge of the first display film layer. 
     
     
       12. The OLED display device according to  claim 1 , wherein the first display film layer comprises a base substrate, and the base substrate comprises a first flexible substrate layer, a first buffer layer, a second flexible substrate layer and a second buffer layer, which are stacked, wherein the first flexible substrate layer and the second flexible substrate layer are made of organic material, the first buffer layer and the second buffer layer are made of inorganic material, and edges of the first flexible substrate layer and the second flexible substrate layer at a side close to the first etching region are recessed along a direction away from the first etching region. 
     
     
       13. The OLED display device according to  claim 1 , wherein the etching region is connected with an entire edge of the display region at the side away from the flat region. 
     
     
       14. The OLED display device according to  claim 1 , wherein the bent region further comprises at least one frame region connected with the stretching region, at least a part of the edge of the frame region at the side away from the flat region is provided with a second etching region, the frame region comprises a second display film layer, and the second etching region is a region where the second display film layer is etched away. 
     
     
       15. A preparation method of an OLED display device, comprising:
 forming a flat region and a bent region around the flat region; wherein, the bent region is bent toward a backlight side of the flat region, and the bent region comprises at least one stretching region; the stretching region comprises a display region and a first etching region, the first etching region is located at an edge of the display region at a side away from the flat region, the first etching region is connected with at least a part of the edge of the display region at the side away from the flat region; the display region comprises at least one opening, and a boundary between the first etching region and the display region bypasses the opening; the display region comprises a first display film layer, and the first etching region is a region where the first display film layer is etched away. 
 
     
     
       16. The preparation method of an OLED display device according to  claim 15 , wherein the first etching region and the opening are prepared by a same etching process. 
     
     
       17. The preparation method of an OLED display device according to  claim 15 , wherein the boundary between the first etching region and the display region is formed with a plurality of concave portions and a plurality of convex portions arranged alternately. 
     
     
       18. The preparation method of the OLED display device according to  claim 17 , wherein the display region is formed with at least two openings in such a way that the concave portions bypass the openings, and the convex portions are positioned between adjacent openings.